Who built this organ?

The action of these unit chests has magnet, primary valve, and pouch. Overkill? Or a Skinner-esque strategy for rapid action?

Called a gamba, though it has characteristics of a viole d'orchestre

The diapason is exceptionally heavy 'linen' lead.

The Stopped Diapason is well made.

Here are some pictures from an organ of unknown manufacture. This patent information from the Stopped Diapason might be a clew.